The correct answer is B. LDAP. In Juniper identity-aware firewall deployments, the SRX Series Firewall integrates with Microsoft Active Directory so that user and group information can be used in security policy decisions. Juniper’s Active Directory identity-source documentation states that the LDAP protocol helps identify the groups to which users belong, and that username and group information are queried from the LDAP service running on the Active Directory domain controller. It also explains that the device uses Lightweight Directory Access Protocol to obtain user and group information required for Active Directory identity-source operation.
Option A, SSH, is wrong because SSH is a device management protocol, not the protocol SRX uses to query Active Directory user/group membership. Option C, DNS, is wrong because DNS can resolve names but does not provide Active Directory group mapping to the firewall. Option D, NETCONF, is wrong because NETCONF is used for network device configuration and automation, not Windows domain-controller identity queries. In a complete identity-aware firewall workflow, SRX may also use WMI/DCOM-related mechanisms to read Windows event-log data, but among the available protocol choices, LDAP is the correct answer because it is the directory protocol used to query user and group information. Reference topics: Active Directory identity source, LDAP, domain controller communication, user and group mapping.
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